Commonwealth legislation

AD/CF6/12 Amdt 2 - Turbine Mid Frame Aft Circumferential Weld

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Commonwealth

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legislative instrument

Plain English Summary

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This amendment makes inspections and any required follow-up actions mandatory for GE CF6-50 and CF6-45 engines’ turbine mid‑frame aft circumferential weld by requiring compliance with FAA AD 90‑23‑15 and the referenced GE Service Bulletin, affecting operators, engine owners and maintenance organisations. It matters because previous weld failures triggered fire warnings and aborted takeoffs; the rule updates the mandated technical reference and (for some engines) extends inspection intervals based on service experience, shifting inspection costs and scheduling to operators.

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Current sections

Direct links to the current provisions in AD/CF6/12 Amdt 2 - Turbine Mid Frame Aft Circumferential Weld.

AD/CF6/12 Amdt 2 - Turbine Mid Frame Aft Circumferential Weld

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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General Electric Turbine Engines - CF6 Series

AD/CF6/12

Amdt 2

Turbine Mid Frame Aft Circumferential Weld 3/91

Applicability: CF6-50/-45 series.

Requirement: Action in accordance with the technical requirements of FAA AD 90-23-15 (Amdt 39-6754).

Note: GE SB 72-957 Rev. 2 refers.

Compliance: As specified in the Requirement Document.

Background: The AD was initially raised to mandate the requirements of GE 72-957 which introduced inspections to insure against conditions which could release hot air into the core cowl cavity. Two such events resulted in take-off aborts due to fire warning indications.

This amendment is raised to update the requirement in accordance with the FAA AD incorporating the latest revision of the manufacturer’s SB covering the problem. It extends inspection intervals for certain engines on the basis of service experience.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/CF6/12 Amdt 2 - Turbine Mid Frame Aft Circumferential Weld